Closing device for the material-receptacles of automatic weighingmachines



J. LAMBERTZ.

CLOSING DEVICE FOR THE MATERIAL RECEPTACLES OF AUTOMATIC WEIGHINGMACHINES.

APPLICATION FILED NOV. 10. 1917.

1,337,842. Patented Apr. 20, 1920.

2 UN TED STATFE ATN FFICE.

JOSEF LAMBERTZ, OF HENNEF-SN-TETESIEG, GERMANY.

CLOSING DEVICE FOR THE MATERIAL-REGEPTAOLES OF AUTOMATIC WEIGHING-MACHINES.

Application filed November 10, 1917.

To all whom it may concern:

Be it known that I, J osnr Linxrnnn'rz, a subject of the German Emperor,residing at Hennef on the Sieg, Germany, have invented certain new anduseful Improvements in Closing Devices for the Material Receptacles oiAutomatic Weighing-Machines, of which the following is a speclfication.

The present invention refers to a closing device for the materialreceptacle of automatic Weighing machines, in which there is a catch anda lever for holding the balance beam on the emptying of the receptacle.in weighing machines of this description it IS diificult to provide fora proper seal or closure of the material receptacle to such an extentthat therecan be no loss or leakage of the material during the weighingoperation, if this material is ofa powdery nature. According to thepresent invention the bottom of the receptacle being formed by a hingedflap is closed in the lowest position of the receptacle by a releasablelever, comprising a cam, which is so shaped that it presses the bottomflap in its closing position against the rim of the opening perfectlytight. The device is so constructed that the catch lever mentioned abovecan release the In the construction shown in Figs. 1 to 3 the catchlever a is constructed in the known manner, in which the upper armcarries an antifriction roller 5 designed to press against aprolongation c of the receptacle rod (Z. On the receptacle 7'' a closinglever g is rotatably attached having on its lower part a cam h, which isso shaped that it can press the flap z' in its closing position againstthe rim of the opening of the receptacle The upper end of the lever g isSpecification of Letters Patent.

Patented Apr. 20, 1920. Serial No. 201,297.

connected by a toggle joint m to a stud 70 on the receptacle 7'',adapted to be held in stretched position by a pin a also attached to theouter wall of the receptacle. That part or arm of the toggle oint, whichis next to the stud 7c, is provided with a second 0 about at ri htangles. XV hen the receptacle is to be emptied, a stud p 011 the catchlever a strikes against the arm 0, when on the receptacle being filledthe catch lever is released from the pawl 9. Normally the pawl 9 holdsthe lever a by engaging a pin r until this lever is oscillated by a stud5 attached to the carrying rods 8 of the weight pan t, when the beam 14oscillates to a sufiicient extent after the receptacle 7' is filled.This operation taking place, the catch lever a is moved from theposition shown in Fig. 1 into the position shown in-Fig. 2, by whichmovement in the usual manner the How of the material into thereceptacleis interrupted and the toggle joint is allowed to collapse, asshown in Fig. 2 and the cam it releases the bottom fiap i. The materialin the receptacle opens the flap i by its own weight.

The flap i is provided beyond its hinge with a weighted prolongationcarrying a pin 00, which projects into a slot 10 of a rod 10 attached toa weighted lever 41. This lever is fulcrumed on the outer wall of thereceptacle in such position and it is of such length that, when the flap2' is opened and thus the pin :0 is moved upward in the slot 10 of therod 10 the weighted lever 11 is enabled to oscillate from the positionshown in Fig. 1 into the position shown in Fig. 2 catching hold of thecatch lever a, which by the roller Z) in known manner holds thereceptacle 7 in its lowest position. When the receptacle is emptied, sothat no more material rests on the flap 2', the latter is closed by itscounter weight in known manner. In doing so, its stud 0a strikes againstthe lower end wall of the slot to and the rod w draws the weighted leveru back into the position shown in Fig. 1 out of the way of the lever a.Consequently the lever 04 loses its hold and the closing lever 9 can bebrought into the position shown in Fig. 1 by a counter weight y attachedto a small arm y" of the lever g. The cam it thus catches hold of thebottom flap i and presses it against the rim of the opening of thereceptacle. Thereupon the catch lever a also returns into the positionshown 111 Fig. 1 by known means and will be caught by the pawl Q, sothat a new weighing operation may again be started.

To prolong the time, in which the receptacle is held in lowest positionand to allow the upward movement not to take place until the last momentshortly before the closure of the receptacle, the holding lever '0 canbe provided with an upwardly extending arm Q21, Fig. 3, preferably about90 and this arm will hold the catch lever a for a short time, eventhough the stud w has engaged the end of the slot w.

In the modification shown in Figs. i and 5 the catch lever a has asomewhat different shape. It is rotatably attached to the framing of themachine considerably lower and is provided with a horizontal arm (1which is adapted to be engaged by a projection .2 attached to the flap iwhen the latter closes. In the lowest position of the materialreceptacle f the catch lever a catches hold of a pin 0 attached to thereceptacle 7, the lever a having a pawl shaped arm Z2 for this purpose,so that also in this case the receptacle is held in its lowest positionwhen being emptied. The release of the closing de vice in this case isbrought about by a projection 39 attached to the frame of the machineand which strikes the toggle joint on, so as to collapse it, Fig. 5.

Instead of providing the lever g with a counter weight g as describedwith reference to Figs. 1 and 2, the lever y can be provided with aninwardly directed arm 3 which is struck by a projection 1 on the bottomflap, when the latter is closed.

From the above it will be understood that the emptying of the receptacletakes place as soon as the toggle joint m knocks against the projectionp lVhen the receptacle is empty and the flap 2' no more weighted by anymaterial, it closes under the action of its counter weight 3, theprojection z striking against the arm a of the lever a and withdraws thelatter from the pin 0 whereupon the receptacle ean be moved upward.Shortly after the projection a has engaged the arm a also the projectionstrikes against the arm g thus causing the cam 72 of the lever g tocatch hold of the bottom.

I claim:

1. In an automatic weighing machine, a weighing receptacle, a hingedflap for closing the bottom thereof, a lever having a cam adapted toengage the flap to keep the latter in closed position, and means torelease the cam on the downward movement of the weighing receptacle whenfilled.

2. In an automatic weighing machine, a weighing receptacle, a hingedflap for clos ing the bottom thereof, a lever having a cam adapted topress against the edge of the flap to keep the latter in closedposition, a toggle joint normally holding the said lever with its cam inclosing position when stretched, and means adapted to collapse thetoggle on the downward movement of the receptacle to release the cam.

3. In an automatic weighing machine, a weighing receptacle, a hingedflap for closing the bottom thereof, a lever having a cam adapted topress against the edge of the flap from below to keep the latter inclosed position, a toggle joint normally holding the said lever with itscam in closing position when stretched, means to collapse the toggle onthe downward movement of the receptacle, and a catch lever fulcrumed onthe framing of the machine and adapted to hold the receptacle in itslowest position until the latter is empty.

4. In an automatic weighing machine, a weighing receptacle, a hingedflap for closing the bottom thereof, a lever having a cam adapted topress against the edge of the flap from below to keep the latter inclosed position, a toggle joint normally holding the said lever with itscam in closing position when stretched, and a catch lever fulcrumed onthe framing of the machine and adapted to collapse the toggle joint onthe downward movement of the receptacle.

5. In an automatic weighing machine, a weighing receptacle, a leverhaving a cam adapted to press against the edge of the flap from below tokeep the latter in closed position, a toggle joint normally holding saidlever with its cam in closing position and adapted to collapse on thedownward movement of the receptacle, a catch lever fulcrumed on theframing of the machine adapted to collapse the toggle joint on thedownward movement of the receptacle, a second lever fulcrumed on thewall of the receptacle and connected with the bottom flap for holdingthe said catch lever in osition after the said toggle joint has eencollapsed, whereby the same is held in its released position until thereceptacle is emptied and the flap closes again to withdraw the lastnamed lever from the catch lever.

6. In an automatic weighing machine, a weighing receptacle, a hingedflap for closing the bottom thereof, a lever having a cam adapted topress against the edge of the flap from below to keep the flap in closedposition, a toggle joint normally holding the said lever with its cam inclosing position, a catch lever fulcrumed on the framing of the machineand adapted to hold the receptacle in its lowest position until thelatter is empty, and to collapse the toggle joint on the downwardmovement of the rece tacle, a second lever fulcrumed on the wa of thereceptacle and connected with the bottom flap for holding the said catchlever in position after the same toggle joint has been collapsed,whereby the cam is held in its released position until the receptacle isemptied and the flap closes again to withdraw the last named lever fromthe catch lever,

the last named lever at its end provided with a lateral arm to hold thecatch lever for a certain time.

JOSEF LAMBERTZ. Witnesses:

PETER DITTSOHEID,

CHRISTIAN DITTSCHEID.

